Pub Date : 2025-03-15DOI: 10.1016/j.optcom.2025.131761
Md. Ariful Islam Bhuiyan , Md. Shamim Reza , Avijit Ghosh , Hmoud Al-Dmour , Yedluri Anil Kumar , Muhammad Ihsan Ibn Rahim , Md. Aktarujjaman , Fahima Yeasmin , Hamad Al-Lohedan (.) , R. Jothi Ramalingam , Md. Selim Reza
The pursuit of alternative absorber materials with higher structural and thermal stability has been fueled by the growing demand for high-efficiency and stable perovskite solar cells (PSCs). Using its improved durability and optoelectronic qualities, this work investigates RbPbI3 as a possible substitute for conventional perovskites. Using SCAPS-1D to model an Ag/FTO/ETL/RbPbI3/Ni device structure, a power conversion efficiency (PCE) of 28.12 % was first obtained with SnS2 ETL (electron transport layer). Then, hole transport layer (HTL) concept has been used to improve the performances more. The thickness, defect density, and doping concentration of ETL and HTL, and absorber were all methodically optimized to improve performance. This led to a markedly improved VOC of 1.22 V, PCE of 32.72 %, JSC of 32.21 mA/cm2, and FF of 83.27 % with MoO3 HTL. The new results demonstrate that RbPbI3 is a suitable substitute for long-term solar energy applications due to its improved stability, improved charge transport through SnS2 and MoO3, and decreased recombination losses. This research will have an impact on the development of high-performance, stable, and eco-friendly photovoltaic technologies in the future by directing the experimental validation and manufacture of RbPbI3-based PSCs.
{"title":"Optimized RbPbI3-Based perovskite solar cells with SnS2 ETL and MoO3 HTL achieving simulated PCE of 32.72%","authors":"Md. Ariful Islam Bhuiyan , Md. Shamim Reza , Avijit Ghosh , Hmoud Al-Dmour , Yedluri Anil Kumar , Muhammad Ihsan Ibn Rahim , Md. Aktarujjaman , Fahima Yeasmin , Hamad Al-Lohedan (.) , R. Jothi Ramalingam , Md. Selim Reza","doi":"10.1016/j.optcom.2025.131761","DOIUrl":"10.1016/j.optcom.2025.131761","url":null,"abstract":"<div><div>The pursuit of alternative absorber materials with higher structural and thermal stability has been fueled by the growing demand for high-efficiency and stable perovskite solar cells (PSCs). Using its improved durability and optoelectronic qualities, this work investigates RbPbI<sub>3</sub> as a possible substitute for conventional perovskites. Using SCAPS-1D to model an Ag/FTO/ETL/RbPbI<sub>3</sub>/Ni device structure, a power conversion efficiency (PCE) of 28.12 % was first obtained with SnS<sub>2</sub> ETL (electron transport layer). Then, hole transport layer (HTL) concept has been used to improve the performances more. The thickness, defect density, and doping concentration of ETL and HTL, and absorber were all methodically optimized to improve performance. This led to a markedly improved V<sub>OC</sub> of 1.22 V, PCE of 32.72 %, J<sub>SC</sub> of 32.21 mA/cm<sup>2</sup>, and FF of 83.27 % with MoO<sub>3</sub> HTL. The new results demonstrate that RbPbI<sub>3</sub> is a suitable substitute for long-term solar energy applications due to its improved stability, improved charge transport through SnS<sub>2</sub> and MoO<sub>3</sub>, and decreased recombination losses. This research will have an impact on the development of high-performance, stable, and eco-friendly photovoltaic technologies in the future by directing the experimental validation and manufacture of RbPbI<sub>3</sub>-based PSCs.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131761"},"PeriodicalIF":2.2,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-15DOI: 10.1016/j.optcom.2025.131726
Skylar R. Turner , Brian R. La Cour
We introduce the pinching operator, which extends the theory of squeezing operators to non-Gaussian operators, and use it to approximate -photon entangled states using a pinched vacuum state and pinching tensor of rank . A simple recursion relation is derived for generating the Bogoliubov transformed creation and annihilation operators, which may be used to express the pinched state as a statistically equivalent set of nonlinearly transformed complex Gaussian random variables. Using this representation, we compare low-order approximations of the pinched state to entangled multiphoton Fock states, such as Greenberger–Horne–Zeilinger (GHZ) and W states. Using post-selection and a threshold detector model to represent non-Gaussian measurements, we find that this model is capable of producing states with a fidelity comparable to that of experimentally prepared multiphoton entangled states. Our results show that it is possible to classically simulate large multiphoton entangled states to high fidelity within the constraints of finite detection efficiency.
{"title":"Pinching operators for approximating multiphoton entangled states","authors":"Skylar R. Turner , Brian R. La Cour","doi":"10.1016/j.optcom.2025.131726","DOIUrl":"10.1016/j.optcom.2025.131726","url":null,"abstract":"<div><div>We introduce the pinching operator, which extends the theory of squeezing operators to non-Gaussian operators, and use it to approximate <span><math><mi>n</mi></math></span>-photon entangled states using a pinched vacuum state and pinching tensor of rank <span><math><mi>n</mi></math></span>. A simple recursion relation is derived for generating the Bogoliubov transformed creation and annihilation operators, which may be used to express the pinched state as a statistically equivalent set of nonlinearly transformed complex Gaussian random variables. Using this representation, we compare low-order approximations of the pinched state to entangled multiphoton Fock states, such as Greenberger–Horne–Zeilinger (GHZ) and W states. Using post-selection and a threshold detector model to represent non-Gaussian measurements, we find that this model is capable of producing states with a fidelity comparable to that of experimentally prepared multiphoton entangled states. Our results show that it is possible to classically simulate large multiphoton entangled states to high fidelity within the constraints of finite detection efficiency.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131726"},"PeriodicalIF":2.2,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-15DOI: 10.1016/j.optcom.2025.131718
Yuehua Deng , Xiaoyan Huang , Shengru Zhou , Shaoqi Li , Yijiao Zhu , Yang Yu , Junbo Yang
Optical tweezers, with their excellent manipulation precision, have become a vital tool for exploring the microscopic world and have significantly advanced research in physical and biological sciences. However, enhancing system integration and multifunctionality remains a critical challenge. In this study, we adopt a shared aperture approach to design and construct a polarisation-insensitive multifunctional optical tweezer system with a high numerical aperture. This system can capture, rotate, and sort various nanospheres in parallel. Through theoretical analyses and numerical simulations, we propose an innovative method to coaxially focus a Gaussian spot with a vortex spot, generating a unique light field for conducting photodynamic analyses of particles. Furthermore, our method enables the generation of numerous arbitrary-state light fields in free space with uniformly normalised electric field strengths. These foci ensure uniform light field distribution and consistent particle capture, enhancing the precision of optical tweezers in biophysics, materials science, and nanotechnology. This work also provides novel theoretical insights for microscale precision manipulation and analysis.
{"title":"Holographic multi-focus multifunctional metalens realises particle capture, rotation and sorting","authors":"Yuehua Deng , Xiaoyan Huang , Shengru Zhou , Shaoqi Li , Yijiao Zhu , Yang Yu , Junbo Yang","doi":"10.1016/j.optcom.2025.131718","DOIUrl":"10.1016/j.optcom.2025.131718","url":null,"abstract":"<div><div>Optical tweezers, with their excellent manipulation precision, have become a vital tool for exploring the microscopic world and have significantly advanced research in physical and biological sciences. However, enhancing system integration and multifunctionality remains a critical challenge. In this study, we adopt a shared aperture approach to design and construct a polarisation-insensitive multifunctional optical tweezer system with a high numerical aperture. This system can capture, rotate, and sort various nanospheres in parallel. Through theoretical analyses and numerical simulations, we propose an innovative method to coaxially focus a Gaussian spot with a vortex spot, generating a unique light field for conducting photodynamic analyses of particles. Furthermore, our method enables the generation of numerous arbitrary-state light fields in free space with uniformly normalised electric field strengths. These foci ensure uniform light field distribution and consistent particle capture, enhancing the precision of optical tweezers in biophysics, materials science, and nanotechnology. This work also provides novel theoretical insights for microscale precision manipulation and analysis.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131718"},"PeriodicalIF":2.2,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-14DOI: 10.1016/j.optcom.2025.131758
Juntao Tan , Jiatong Liu , Bin Wang , Pengke Yu , Yang Li , Shaofeng Zheng , Jiaming Li , Qingmao Zhang
Precisely constructing TiO2 nanocrystals poses significant challenges. In this work, online spectral analysis for TiO2 nanocrystals under laser was proposed. In the complex spectral data, the wavelength dependence analysis was performed. Effective signals at 824 nm, 884 nm, 918 nm and 995 nm were extracted. 824 nm and 1100 nm revealed the size evolution; 884 nm, 918 nm, 995 nm, and 3300 cm−1 revealed the nanocrystals evolution, intermediate grouping, and structural features. Additionally, preliminary particle size correlation of TiO2 was described. This work demonstrates a valuable way for TiO2 nanocrystals construction with the use of online spectral analysis.
{"title":"An online spectroscopy monitoring strategy for precisely constructing TiO2 nanocrystals during pulsed laser irradiation in liquids","authors":"Juntao Tan , Jiatong Liu , Bin Wang , Pengke Yu , Yang Li , Shaofeng Zheng , Jiaming Li , Qingmao Zhang","doi":"10.1016/j.optcom.2025.131758","DOIUrl":"10.1016/j.optcom.2025.131758","url":null,"abstract":"<div><div>Precisely constructing TiO<sub>2</sub> nanocrystals poses significant challenges. In this work, online spectral analysis for TiO<sub>2</sub> nanocrystals under laser was proposed. In the complex spectral data, the wavelength dependence analysis was performed. Effective signals at 824 nm, 884 nm, 918 nm and 995 nm were extracted. 824 nm and 1100 nm revealed the size evolution; 884 nm, 918 nm, 995 nm, and 3300 cm<sup>−1</sup> revealed the nanocrystals evolution, intermediate grouping, and structural features. Additionally, preliminary particle size correlation of TiO<sub>2</sub> was described. This work demonstrates a valuable way for TiO<sub>2</sub> nanocrystals construction with the use of online spectral analysis.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131758"},"PeriodicalIF":2.2,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-12DOI: 10.1016/j.optcom.2025.131754
Huihao He , Paula Russell-Hill , Werner J. Blau , Ivan M. Kislyakov , Nikolay N. Rosanov , Ningning Dong , Jun Wang
We report the realization of a photonic crystal random fiber laser (RFL) doped with different gain media. We studied the small-signal gain of devices by the variable stripe length technique and the effect of polyvinyl pyrrolidone (PVP) polymer on the random lasing. PVP significantly improved the features of the RFL because of the increase in scattering mean free path. We also systematically measured random lasing parameters, including threshold, linewidth, and polarized characteristics. Finally, time-dependent theory for random lasers was used to explain the evolution of the lasing spectrum.
{"title":"Random lasing from rhodamine 6G-microsphere doped photonic crystal fibers","authors":"Huihao He , Paula Russell-Hill , Werner J. Blau , Ivan M. Kislyakov , Nikolay N. Rosanov , Ningning Dong , Jun Wang","doi":"10.1016/j.optcom.2025.131754","DOIUrl":"10.1016/j.optcom.2025.131754","url":null,"abstract":"<div><div>We report the realization of a photonic crystal random fiber laser (RFL) doped with different gain media. We studied the small-signal gain of devices by the variable stripe length technique and the effect of polyvinyl pyrrolidone (PVP) polymer on the random lasing. PVP significantly improved the features of the RFL because of the increase in scattering mean free path. We also systematically measured random lasing parameters, including threshold, linewidth, and polarized characteristics. Finally, time-dependent theory for random lasers was used to explain the evolution of the lasing spectrum.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131754"},"PeriodicalIF":2.2,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-12DOI: 10.1016/j.optcom.2025.131619
T. Meyneng , Y. Messaddeq , R. Kashyap
Anti-Stokes fluorescence cooling has emerged as an effective and sophisticated method for the thermal management of optical systems. Following its recent demonstration in silicate materials, active research is focused on scaling these findings to high-power radiation-balanced laser systems. With advancements in the understanding of the underlying physics, along with improved material engineering, experimental results have exceeded initial expectations, culminating in the successful development of the first iterations of radiation-balanced fiber laser systems. This article reviews the progress in these findings and outlines future perspectives, particularly in light of recent advancements in vapor deposition technology and fiber engineering.
{"title":"Anti-Stokes fluorescence cooling in silica, achievements and technological perspectives","authors":"T. Meyneng , Y. Messaddeq , R. Kashyap","doi":"10.1016/j.optcom.2025.131619","DOIUrl":"10.1016/j.optcom.2025.131619","url":null,"abstract":"<div><div>Anti-Stokes fluorescence cooling has emerged as an effective and sophisticated method for the thermal management of optical systems. Following its recent demonstration in silicate materials, active research is focused on scaling these findings to high-power radiation-balanced laser systems. With advancements in the understanding of the underlying physics, along with improved material engineering, experimental results have exceeded initial expectations, culminating in the successful development of the first iterations of radiation-balanced fiber laser systems. This article reviews the progress in these findings and outlines future perspectives, particularly in light of recent advancements in vapor deposition technology and fiber engineering.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131619"},"PeriodicalIF":2.2,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-12DOI: 10.1016/j.optcom.2025.131753
Xinzheng Yu , Limin Zhang , Xi Zhang , Dongyuan Liu , Yanqi Zhang , Feng Gao
To achieve more accurate and reliable diffuse optical tomography (DOT) imaging, as well as increase the interpretability and generalizability of the DOT image reconstruction using deep learning, three distinct physics-constrained neural network (PCNN) architectures were proposed, with the stacked auto-encoder (SAE) neural network as a benchmark for comparison. These architectures directly incorporated MRI image gray values as physical prior information in three distinct ways: merging them into the network input, combining them into the loss function through a rescaling strategy by defining a total variation function, and combining both of the approaches. To investigate the effectiveness of the proposed networks, a series of numerical simulations were first performed, and the results were quantitatively evaluated and compared with the purely data-derived SAE neural network. Subsequently, the well-trained networks based on the simulation data were implemented to reconstruct the phantom experimental data to further investigate the effectiveness of the proposed methods. The experimental results revealed that the performance of the three PCNN models is superior to that of the pure neural network, with the third network architecture demonstrating the most significant advantages in terms of reconstruction fidelity and noise robustness.
{"title":"High-fidelity diffuse optical tomography imaging based on MRI physics information-constrained stacked autoencoder neural network","authors":"Xinzheng Yu , Limin Zhang , Xi Zhang , Dongyuan Liu , Yanqi Zhang , Feng Gao","doi":"10.1016/j.optcom.2025.131753","DOIUrl":"10.1016/j.optcom.2025.131753","url":null,"abstract":"<div><div>To achieve more accurate and reliable diffuse optical tomography (DOT) imaging, as well as increase the interpretability and generalizability of the DOT image reconstruction using deep learning, three distinct physics-constrained neural network (PCNN) architectures were proposed, with the stacked auto-encoder (SAE) neural network as a benchmark for comparison. These architectures directly incorporated MRI image gray values as physical prior information in three distinct ways: merging them into the network input, combining them into the loss function through a rescaling strategy by defining a total variation function, and combining both of the approaches. To investigate the effectiveness of the proposed networks, a series of numerical simulations were first performed, and the results were quantitatively evaluated and compared with the purely data-derived SAE neural network. Subsequently, the well-trained networks based on the simulation data were implemented to reconstruct the phantom experimental data to further investigate the effectiveness of the proposed methods. The experimental results revealed that the performance of the three PCNN models is superior to that of the pure neural network, with the third network architecture demonstrating the most significant advantages in terms of reconstruction fidelity and noise robustness.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131753"},"PeriodicalIF":2.2,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-12DOI: 10.1016/j.optcom.2025.131752
Chunhua Qin , Tingnuo Pan , Yicheng Li , Bo Lv , Wenjia Li , Yuxiang Li , Ping Li , Zheng Zhu , Chunying Guan , Jinhui Shi
In this work, multifunctional polarization modulation of linearly and circularly polarized light in near-infrared range is achieved based on the all-dielectric metamaterial with bilayer silicon nanorods. In this design, a strong polarization conversion is accompanied by the Fano resonance generated from the coupling effect between the silicon blocks. In addition, the asymmetric transmission and circular dichroism are attained by rotating the silicon bar of the lattice. This work provides a way to realize the multifunctional polarization modulation devices in subwavelength platforms.
{"title":"Multifunctional polarization modulation based on all-dielectric metamaterial","authors":"Chunhua Qin , Tingnuo Pan , Yicheng Li , Bo Lv , Wenjia Li , Yuxiang Li , Ping Li , Zheng Zhu , Chunying Guan , Jinhui Shi","doi":"10.1016/j.optcom.2025.131752","DOIUrl":"10.1016/j.optcom.2025.131752","url":null,"abstract":"<div><div>In this work, multifunctional polarization modulation of linearly and circularly polarized light in near-infrared range is achieved based on the all-dielectric metamaterial with bilayer silicon nanorods. In this design, a strong polarization conversion is accompanied by the Fano resonance generated from the coupling effect between the silicon blocks. In addition, the asymmetric transmission and circular dichroism are attained by rotating the silicon bar of the lattice. This work provides a way to realize the multifunctional polarization modulation devices in subwavelength platforms.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131752"},"PeriodicalIF":2.2,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-12DOI: 10.1016/j.optcom.2025.131750
Yu Ao , Xingang Dai , Yanjun Hu , Bowen Niu , Qun Dai , Yu Qiao , Xuanwei Xu , Yuan Li , Guofang Fan
The remarkable performance of metamaterial perfect absorbers in applications such as solar cells, sensors, and photoconversion devices has underscored their progressively important role in diverse areas of scientific and technological development. However, designing perfect absorbers that achieve both narrowband and broadband absorption with relatively simple structures remains a significant challenge. This paper presents a bi-directional metamaterial perfect absorber comprising a silver grating, featuring a specialized structure engineered to simultaneously achieve narrowband and broadband perfect absorption in the same nanostructure. Four distinct absorption peaks are observed when the light source is incident from the grating portion located above the structure, exhibiting absorptivity of 91.8 %, 99.8 %, 94.3 % and 93.2 %. All of these peaks demonstrate favorable sensing performance. In contrast, broadband perfect absorption is observed across the wavelength range of 650–2300 nm when the light source is incident from the bottom planar section of the proposed absorber, exhibiting an average absorption of 95.85 %. Simulation results demonstrate that our designed absorber exhibits excellent narrowband and broadband absorption properties and is simpler and easier to fabricate than other bidirectional absorber materials, suggesting its potential for broader applications compared to traditional absorbers.
{"title":"Five layer bi-directionally adjustable perfect metamaterial absorber based on silver gratings with four narrow bands and 1650 nm broadband absorptions","authors":"Yu Ao , Xingang Dai , Yanjun Hu , Bowen Niu , Qun Dai , Yu Qiao , Xuanwei Xu , Yuan Li , Guofang Fan","doi":"10.1016/j.optcom.2025.131750","DOIUrl":"10.1016/j.optcom.2025.131750","url":null,"abstract":"<div><div>The remarkable performance of metamaterial perfect absorbers in applications such as solar cells, sensors, and photoconversion devices has underscored their progressively important role in diverse areas of scientific and technological development. However, designing perfect absorbers that achieve both narrowband and broadband absorption with relatively simple structures remains a significant challenge. This paper presents a bi-directional metamaterial perfect absorber comprising a silver grating, featuring a specialized structure engineered to simultaneously achieve narrowband and broadband perfect absorption in the same nanostructure. Four distinct absorption peaks are observed when the light source is incident from the grating portion located above the structure, exhibiting absorptivity of 91.8 %, 99.8 %, 94.3 % and 93.2 %. All of these peaks demonstrate favorable sensing performance. In contrast, broadband perfect absorption is observed across the wavelength range of 650–2300 nm when the light source is incident from the bottom planar section of the proposed absorber, exhibiting an average absorption of 95.85 %. Simulation results demonstrate that our designed absorber exhibits excellent narrowband and broadband absorption properties and is simpler and easier to fabricate than other bidirectional absorber materials, suggesting its potential for broader applications compared to traditional absorbers.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131750"},"PeriodicalIF":2.2,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-12DOI: 10.1016/j.optcom.2025.131755
Jiawei Meng , Yifan Yu , Lian Xiang
Based on the improved coupled power equations, a signal-to-noise ratio (SNR) calculation model is proposed for multi-core fiber C + L band SDM-WDM systems. Based on this model, the effects of inter-core crosstalk (ICXT) and Stimulated Raman Scattering (SRS) on the transmission performance is investigated in the MCF C + L band WDM system. The results show that both SRS and ICXT will influence the system performance significantly. Furthermore, four strategies for optimizing the channel incident power are investigated for the SRS impact. The output power flattening strategy is found to perform well in terms of system capacity and optimization efficiency.
{"title":"Transmission performance analysis and optimization of C+L band SDM-WDM system with weakly coupled multi-core fiber","authors":"Jiawei Meng , Yifan Yu , Lian Xiang","doi":"10.1016/j.optcom.2025.131755","DOIUrl":"10.1016/j.optcom.2025.131755","url":null,"abstract":"<div><div>Based on the improved coupled power equations, a signal-to-noise ratio (SNR) calculation model is proposed for multi-core fiber C + L band SDM-WDM systems. Based on this model, the effects of inter-core crosstalk (ICXT) and Stimulated Raman Scattering (SRS) on the transmission performance is investigated in the MCF C + L band WDM system. The results show that both SRS and ICXT will influence the system performance significantly. Furthermore, four strategies for optimizing the channel incident power are investigated for the SRS impact. The output power flattening strategy is found to perform well in terms of system capacity and optimization efficiency.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131755"},"PeriodicalIF":2.2,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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